Because the hazy lens scatters light, seeing halos around lights, particularly at night, is a common sign of cataract. It can also sometimes happen due to dry eyes, glasses power changes, or increased eye pressure, so an eye examination is important. Cataracts usually worsen slowly over time, and the main treatment is cataract surgery when vision starts affecting daily activities. For a thorough examination, please see an eye specialist, particularly if you also have pain, redness, abrupt vision loss, or excruciating headaches.